product_list = [
    ("华为P30",3800),
    ("Mac pro",16000),
    ("milk tea",38),
    ("bike",888),
    ("crabs",88),
    ("head first python",128),
    ("watch",60),
    ("book",100),
]

shopping_car = []
zhifubao = input("请输入你的支付宝数字余额:")
if zhifubao.isdigit():
    zhifubao = int(zhifubao)
    while True:
        for item in product_list:
            print(product_list.index(item),item)
        choice = input("请输入商品编号：")
        if choice.isdigit():
            choice = int(choice)
            if choice >=0 and choice <=8:
                if zhifubao >= product_list[choice][1]:
                    zhifubao = zhifubao - product_list[choice][1]
                    shopping_car.append(product_list[choice])
                    print("你已经将商品%s都加到了购物车，你的支付宝余额是%s"%(product_list[choice][0],zhifubao))
                else:
                    print("你的支付宝余额不足，请选择其他商品")
            else:
                print("你选择的商品不在商品列表里面")
        elif choice == "q":
            print("------购物车清单------")
            for item in shopping_car:
                print(item)
            print("你的支付宝余额是%s"% zhifubao)
            break
        else:
            print("请你输入商品编号:")
else:
    print("请输入数字的支付宝余额")
